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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11f9ac268e93ff384d70e1302effafef76b673be9f3832c000b3ab6d584c848' 
  AND token = 'hQsv9UIMcMspQuJf/N8segzSkc52kmaru/K/OYhAAKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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