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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7c915515fe6e6ea461f9246a4245a14a7ce595cf8c32b3e21d46ba40790128' 
  AND token = 'wxSVhfAF7wKtnE8TAFw/wz0r8KBwEUap703MHEC4NnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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