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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e50d9e556b7ecd91a27d6c60a58807e54d97b0cd9f87a4b9a72625cdf7429b' 
  AND token = 'bw7bFzyOKFkhUznb6Egaa3yVrQ0xUchtGTazpAuJcZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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