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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35622d0e867784c0cb6048ded59a436bb4c9f150a4cc3b3416ef1f116d98f573' 
  AND token = '9dMOUT+/F6A30OGcHT2hJnALUiXuu8SR152qj5zRVMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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