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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410b46fc543f5a1a74829bf19bde37b0d24dfbd6d94113bc94f24ab8ea069cf7' 
  AND token = 'LVFKrzr67FdCLo91f62PMrSumWgTQCrMRvDf4Cxj8V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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