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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe7ead8a5d2cbb0657253c14feef110cc94db8a1d939bfe16a3c42f497c5ec0' 
  AND token = 'E9lFIRRAyXlsfgiE/Hiliuvf2S3LmgMM0vu4tsPG/8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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