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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667ac3a1293edf20c5adc43bc3b98e413ede5793fd46ec404b94c89f204b44ba' 
  AND token = 'jZSaOz3SLTsOIRCn/yNz6Q/vHPCjJ0/6l9A+vPr9eCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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