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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0f6287e5ba52d1909b891789387a5049a70cd278df28ee17b913aaaee6d1cc' 
  AND token = 'cRDdu46uLbv9YWldhCFTiD33Mr4cRh5g8/LSrvZxfg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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