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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb905e44ab88e2d3585d1d432d460e5d37e19cbd1635f1e938cbdf8c66f67bd' 
  AND token = 'EHknhuAN990o1x43vkmwhdfcY1v17uLS8WgoHicrsmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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