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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3172f7592b1100bb2525f6c1f0d0e77de19fe3614456b9738485e1b6f545b3' 
  AND token = 'l6E2hy3XSiT4LBbc7+4PXOP0KpvWsSNRbOGAeiSiqVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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