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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0c026c5b5b4fdc88ecfcb9da9473a61edee8bfbb05e6a135331bdd013e0263' 
  AND token = 'nji75w+qZytiic6S3rsG7JrjRCnR831+Hk7sv/ootpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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