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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a480e803d62915095d6d0d2c4ada0acd0d1c297eed218c224cb6ea77e4bf42' 
  AND token = 'Xl/z5nEGawfblppYUftncsTN0A8LAoONqLP63u6+B+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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