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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915f2b9b2ceec9f4e4d7072c7f9cb999bb60de47e7d0793447d220d6dfd0b9ab' 
  AND token = 'kZRZGoKAaNT9LKFys+KeAcKnc/MHOPsZkuYv0ev9IKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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