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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a509174107452d73cc1f7c6d094453833769a4a1180674b6052fb0f0700d1413' 
  AND token = 'ZoQvwdpGjLjFp9wesdLdxJxMLQ2v5iQaji+w6M6z5JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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