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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4750a09760b75a5ef8a5405c0bb77547ada2d55481689e8a364dc7bb8c203d2c' 
  AND token = 'eungWYb0RSAf2xPMJlnlpq0Nei7qmT68CyBtXw0Q8FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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