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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66b862cd559f5a9b298f55acab478cf548a00c833f28aff32758457d1916c5d' 
  AND token = 'CjveD/SZfoCZGV0e2kbSyyuUj0RNjaYBdhfQ3dFnv5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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