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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663f887a249dcfe79339b907eea3a88ea963b03e17bfd42a280b92cbdef01884' 
  AND token = 'B6r22nukPNWPGSREx4KIzDqKNF/6UScsV6wqn80MbDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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