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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a445b0f9b7925dc4b8684a5c8af3f4ba33ec65eeef9d173c785b1cd58f3f18ce' 
  AND token = 'W4c1hEgZ8ux1jkbWdrN7gJSNEaZ1WZxs1zSBu5XU9tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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