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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf472aa8fb1a5f8028d5e45c64d8d2e7818a96d9fe71f56adaf4de44d232df6' 
  AND token = '0pT5807qLyrCVQGzfUnKO6IX+1Ae5ZHaDx8z9Mxhbxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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