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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0895b6c626044c65a29b0a7cd742613899732aef43d5466e0cc814c60c71ae' 
  AND token = 'AaGa0UptET9oRfVflPjq5zjcA1nsS28e50sWBTf3FrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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