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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3b1ee401c8e2eb20ee144010284f6230d77a88be131bf302c7f64ef35b9fe9' 
  AND token = 'o2idQ4YaPSrtcBK+1abFGTW+abnZpLqJRMYldT19aJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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