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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caee509ffcd2b7c6ff6599a3f7d04be60cddb78c947ea44834d61c40ac9fdec1' 
  AND token = 'TjC2RmESCYQ28+jhM8kf75mH7RDUmTMIJXgvTmPKMvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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