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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4181b3c3ce4cd0a82f1ad59488ccb461e7371fb63e2d5c04e2ecf3a0c5e0ff2' 
  AND token = '/qHE0lH/L9ORqP/AOO0nNoB4sP0VMaUzV5udF7BaW+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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