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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a076fd20045fb237465062cb0c14745c72e76d34c5782f5856c59eb158f30e77' 
  AND token = 'QHcfb62YR6UJaKnsZx5+5XabtL/wSDVdhdQPyehnUlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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