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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a5d915c86476527652001cb8a50a7807f2d9213d4b5b38a76592abd3893ec2' 
  AND token = '0is0sIeNl58vD11xNDUe4S23BuwTYv1FXlm5hscvB1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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