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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7022cb9a73908499a38d6ab65d2998f739d9feaa7fce39f7d560aeeee19db3d' 
  AND token = 'EvGdanlzahG4fY4TN9Sykj6uKWzVUfdYTaWjXQcyhZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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