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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc37b2ca31ef84d0105542998ee9f63d2a194725864528d3f71eb762f6c5325' 
  AND token = '9buywVETWTXQoWLa90P2fdpH1wc+0l1YD6fOXDCVgTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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