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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e9b5cbd3641a6731fd0fed1086cd0be49be02723c4d3cb18c7255059c67ea2' 
  AND token = 'CHuNoqS0pU7zoYbX5dCWTvE0s6sYuUu2U5/r95zh6fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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