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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61822fda8de37c3cbf409633ab42840bfc380d49c93768a98974d946c0dd6760' 
  AND token = 'OaaWbw34+9LNqhfLcRibSZKMwzm4T43KVACcRPV7Cyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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