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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd7b001d81c119f64a30666238d2e9bbb562fbd1ddb0d1d1b33e22d0e535e6a' 
  AND token = 'FYN8adU7Fon6AModMt+MwmmMQ17zTVna7uj74GoJR6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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