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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e98d9bb165b0da2da6cac07291a6873e784248ddafa34bb62da488e66300f7e' 
  AND token = 'XqhX0el+Zy/h0HQLD6PDHFucKPStGi2AXQVqo8DrUHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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