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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8b7e6dc1002932233006e6452a9d0a906046e1cdf62ca44fcb93f9c38ac635' 
  AND token = 'qJzA0lGDFueZS5BscQ5UkxpvllQaimiWGJk0sVVzzuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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