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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af4d38b13e111ea8f30c146d39d4ae8e315dd48cdf377055ddbb04fe1448364' 
  AND token = 'ovp4EJrL0RsmQKR8iXyyGZJVJtABa0iWglwo/3jUkaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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