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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38475224e75149f32f9e1733fc735923128a093c3b716e229a10712024586606' 
  AND token = '2QbVohOfhZnh0gcKjp4I0XljnAL36Nj6cS/NU/IK+OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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