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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac3f0405f99d0840cdaa9556bb100279eddfea9283a1fe9279d15cf83a9f6fd' 
  AND token = 'hRiQJd/wXhTXidQvt4Xgwts3+U5cBHg4n9fFbGl0ltw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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