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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1308fdbb0e42eafdc683d9025c8426915301d544d8f19ef12f9082551e59d509' 
  AND token = '6ir5vBvcudASGOAL/ug6XsYI1Mr2cLjJdt9pvflR35U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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