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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a06a14e85067af7f1baf25679c5565a776e8b33b3105c6d1d2bcb9ccf69627' 
  AND token = 'ebdsmIeTNOBoXkMXCsGpzaeiy7PXtst7x7pULyri4y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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