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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1b582db28965fc34f2217123cbba9f6f744fa182c18284fe9193a63e27d8b9' 
  AND token = 'WBRMWa33yk/Hfjp79yYaA8opgG2IsTbncYuU/IEAsLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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