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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035f583cccd789313b7315f5579e2728c6fc9e18127a0e1dae3795390b78a603' 
  AND token = 'EloJWzFJ32LSF4pj1Ww9EmOOq2XTsTJNmmZDEyhlu7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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