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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9f10bfc1856f5e4609857803c7771c0ebadf3318e015af664cf72eb49b6dfa' 
  AND token = 'dp2S43db4Ln8VNi4KSsnbepNWNFj1Q5b0J9O/Fj9qV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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