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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b40da5a39fec98e9f334091fd6de97be291f431fe26cb919b88e303cf9fd2c1' 
  AND token = 'CwmEui32LpvmQHR4r9UdHsuwrs0HoqOiKGuU+Qo1pck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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