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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484e8668ab0e612352ad5736dc7eccd8cd632bfe7cb0738ef91ba41a3145e2e0' 
  AND token = 'ziCtJ88hFC0v0sB5u7tBj/ukWV93KHKITF8myoZjmfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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