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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00712cd463a2158ce9c4caa30901e25d518645ffff2ee2f21bdf07d55c61720' 
  AND token = 'tb60xV+H34G+Rhunl1NUBaNFTbh6AJO8tpHYKC7ET38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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