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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca33bd51a4b6e1820e29ac191402f3ec35e487f1c0bf9a0f078c607f1267fa7' 
  AND token = 'ewBEwI6jwOR07nfbcC+aSFBUc7ano1cI9oF4e9AKF+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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