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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e5b117939adce1c82abbb20401b356f01d29fd1da24ebd41b2de3a99d247a9' 
  AND token = 'prO0G0R5WM19/5YD9GzW6hx7jNqNydhzSUKhzZy73dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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