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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1cb7e81539b7c698e94c08bda4fa010d866092c1dcd2d67b0278a9d4477cded' 
  AND token = 'fr1W90ACikIM1ony2vWu/ToVfT6tNyrIPu1obiPoWX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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