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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0174766f2db0e3509a6eb33764f270ac484609c17b87fbb260f37a0ad1c9b2' 
  AND token = 'ZxPckOc+0XL3i2jj6MG5OG9hlLdNpgcft85Zju5tchg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}