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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89f8b64081aa2a5559fd44c0474f8992a16a98e7c0c5ddd8ed7aa32e1175472' 
  AND token = 'PmbmDYRyq6KTczuZOI4IgU1MICPWyszmyKhLj1x/41w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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