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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee3e426a9d3df3e5db817060b74139f2c4488d1a41aa88460575ff6108b55d8' 
  AND token = '6Sl91oVSp1iIQXfXKDd26sf4gAF+wbolAwSPie7BS1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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