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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98cd5c69164219d7bd36c2503f177cb1a807314da37812bf5df16b36db0a26b' 
  AND token = 'ykWaGKYNmqHjg2//CcE3ND7p2Bm6SNm+owiB3dS1XPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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