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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c044885240950700d7067563cd83049befaa29622f8be7c10c8bbbeb328bd57' 
  AND token = 'DfFIxwbMK/fd4Z2BFNmIYX9X6ZPWD9oiY/3uQkt0dCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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