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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241b2676f2fb4a1acc90a5155bdca0f44cd8484b8a92db8842aaa7ab94cb2326' 
  AND token = '4aJp4EDW6HaKDB7BrD6megj7NrduU9BMArNmCtPRXKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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