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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc496de21e1f6cfc27e7da2516ce627a1a303b5c1441a9285b8aeb3d5a1dcc61' 
  AND token = 'vo+sp85H9JJ2Xypqutx4PWekMILEOLijSTlh+W6TeBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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