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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7818d2178fc1b6951b126f051cc9a2c9e721d894a2687495c9d3189ac9d127c0' 
  AND token = 'IqeXw6fJWeKHqn0PugOYX3OCMWmzh0/aDYHxHhgxEhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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