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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8aa9ac453480be68b7de15fecb4fb8140cbe50fec8a3c7b4ee8d41cc07cc85a' 
  AND token = 'rfgBSVRG+c/B2DVKFUqq9xpyldGR7l9/G8P1jvr9stw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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