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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8803eca7960d4068addc351a3f0f68c6993fd4cc6614a918f7db378029189397' 
  AND token = 'C7dzgfNqBQsP093i/9oZzaMLvXs8FQzJ7ccf9x2SzE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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