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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4e00b991b40088fa584357baddd425fe9d640486bcc32841bceec463a08036' 
  AND token = 'a7lXdt+Fh0Rkm0W9DqHBjKF5fK4FOv6ra105nAauef4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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