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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69ea8d5d74425c0e446d5fe8412612c55b1199c60e9bbdebd1b7438f1f9e9b1' 
  AND token = 'uNTNTSXZsn8rlWq6JkJ8DIkE+cgPb9Ez+dpIXqeAPXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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