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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8240950fea489ef2ecc99c4b7696a9f3dc2876f9af5b15e843f58c5a9713d9d5' 
  AND token = 'Fc76Fj0wN4aZhU/4aFFd/0iClHyYkCQ8YICQVTgdhL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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