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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793289551ef1b4ff91899e227ab9c3781b84e7a2e79546d158ceb94509199f13' 
  AND token = '4hE/FZ+bWKkdwD/w/z7teh02ScNz+pbmoBbDDIGJJFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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