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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87154f2868f50e0d23ab90b5f474061ebc247d469e9b72258af33729a43bd999' 
  AND token = 'XVwx4G7UoQp3eqM+nNzOwEcsApRc2BoR2yNVBWt+4X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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