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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9062234b53ca7f6d16c7ae32e97bf0d9564b2f8bec0ab368ca7abf89487f4438' 
  AND token = 'h20D3c5XegkicQBQ3dA51F9A/8ZwQ3Z9TgPHVZockO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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