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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553f2bb8cfc0cbf5c97d9269cbd8c442b7817d4c996e2de5f0e3720f336189bb' 
  AND token = '8SbWP1Z9waECvtgijxevPJQhpeIpJr+M7re8hoSuYk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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